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1.
If a rule cannot be explained in a minimum of 6 lines, it can no longer be clarified as a rule.
Rule 303

Rule 303 made famous by Harry "Breaker" Morant and Englishman living in Australia at the start of the 20th century who enlisted in the Australian Armed Forces to help the British fight a war with the Boer's in South Africa.

Random guy "Rule 27 gtfo"
by Recycle Bin123 February 16, 2009
 
2.
Never knowingly be serious. A rule created by the Doctor in the popular BBC series Doctor Who during the series 6 episode "Let's Kill Hitler".
(The Doctor comes out wearing a tux and a top hat.)

River: You're dying! And you stopped to change?

The Doctor: Oh, you should always waste time when you don't have any. Time is not the boss of you. Rule 408. Amelia Pond. Judgment Death machine. Why am I not surprised? Sonic cane.

River: Are you serious?

The Doctor: Never knowingly. Never knowingly be serious. Rule 27. You might want to write these down.
by Sophia42 November 14, 2011
 
3.
If music is playing, you must dance
1: Here's the fight song
2: Come on, we've gotta dance
1: What? Why?
2: Rule 27
by Johnny Postit November 15, 2008